{"id":72930,"date":"2023-04-05T02:58:42","date_gmt":"2023-04-04T23:58:42","guid":{"rendered":"https:\/\/lwallet.com.ua\/product\/coldcard-mk4\/"},"modified":"2026-09-23T01:23:46","modified_gmt":"2026-09-22T22:23:46","slug":"coldcard-mk4","status":"publish","type":"product","link":"https:\/\/lwallet.com.ua\/en\/product\/coldcard-mk4\/","title":{"rendered":"Coldcard MK4"},"content":{"rendered":"

[vc_row][vc_column][vc_tta_tabs][vc_tta_section title=”About the device” tab_id=”1614904919797-d1ece621-8046″][vc_row_inner css=”.vc_custom_1670891302972{margin-top: 20px !important;margin-bottom: 25px !important;}”][vc_column_inner][vc_column_text]<\/p>\n

Coldcard MK4<\/h4>\n

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\"Coldcard<\/div>\n

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Bitcoin-only without unnecessary compromises<\/h4>\n

Coldcard MK4 is built exclusively for Bitcoin. Instead of supporting dozens of networks and tokens, it focuses on one job: keeping your keys isolated and securely signing Bitcoin transactions. This makes the MK4 especially well suited for long-term BTC storage, use with your own node, multisig setups, and users who want full control over every step of their self-custody setup.[\/vc_column_text][vc_column_text]<\/p>\n

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\"Coldcard<\/div>\n<\/div>\n

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Two Secure Elements<\/h4>\n

Coldcard MK4 protects sensitive data with two Secure Elements from different manufacturers. Critical secrets are not entrusted solely to the main processor or a single security chip. This architecture reduces reliance on any one hardware component and makes physical attacks more difficult. That is why the MK4 is designed not only for secure storage.[\/vc_column_text][vc_column_text]<\/p>\n

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\"Coldcard<\/div>\n<\/div>\n

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Air-gapped signing via MicroSD<\/h4>\n

Coldcard MK4 does not need to be connected to a computer to sign transactions. A watch-only wallet creates a PSBT file, which is then transferred to the Coldcard using a MicroSD card. The device displays the transaction details, signs the transaction inside its secure environment, and saves the signed file back to the card. In this setup, there is no direct data connection between the Coldcard and your computer. The private key never leaves the device, while you remain in control of the entire transaction flow \u2014 from creation to verification and signing.[\/vc_column_text][vc_column_text]<\/p>\n

\"Coldcard<\/div>\n

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PIN protection against device tampering<\/h4>\n

The PIN on Coldcard MK4 is split into two parts. After you enter the first part, the device displays two anti-phishing words that you memorize during the initial setup.
\nBefore entering the second part of the PIN, you can verify that the device is showing your expected words. If they have changed, it may indicate that the device has been replaced.[\/vc_column_text][vc_column_text]<\/p>\n

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\"Coldcard<\/div>\n<\/div>\n

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Generate your seed phrase with dice rolls<\/h4>\n

If you do not want to rely entirely on the built-in random number generator, Coldcard MK4 lets you create a BIP39 seed phrase using physical dice rolls. After each roll, simply enter a number from 1 to 6 on the keypad. For sufficient entropy, the manufacturer recommends 99 rolls. Once finished, Coldcard converts the resulting sequence into a properly encoded seed phrase.[\/vc_column_text][vc_column_text]<\/p>\n

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\"Coldcard<\/div>\n<\/div>\n

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MicroSD, NFC, or USB-C \u2014 the choice is yours<\/h4>\n

Coldcard MK4\u2019s primary air-gapped workflow uses MicroSD, but you are not limited to a single way of interacting with the device. NFC can transfer PSBTs, addresses, XPUBs, and other data with a short tap against a compatible smartphone. USB-C can be used with supported desktop wallets, or you can enable Virtual Disk Mode and transfer PSBTs like regular files. USB and NFC are disabled by default and are only enabled if you choose to use them. You can build a fully isolated workflow or choose a more convenient setup for everyday use.[\/vc_column_text][vc_column_text]<\/p>\n

\"Coldcard<\/div>\n

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Screen and keypad for independent verification<\/h4>\n

Coldcard MK4 features a bright 128 \u00d7 64 OLED display and a dedicated numeric keypad. Addresses, amounts, fees, and other important transaction details can be checked directly on the device before confirmation. The physical buttons let you enter your PIN, passphrase, and navigate the menu without relying on a touchscreen. A sliding protective cover shields the display and keypad during storage or transport.[\/vc_column_text][vc_column_text]<\/p>\n

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\"Coldcard<\/div>\n<\/div>\n

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Works with trusted Bitcoin wallets<\/h4>\n

Coldcard MK4 can be used with Sparrow Wallet<\/a>, Electrum, Nunchuk, Specter Desktop, Wasabi Wallet, BlueWallet, and other compatible Bitcoin tools. You are not tied to a single proprietary app and can choose the interface that best fits your workflow. The device supports single-signature and advanced multisig wallets, passphrases, watch-only configurations, and connections to your own Bitcoin node.[\/vc_column_text][vc_column_text]<\/p>\n

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\"Coldcard<\/div>\n<\/div>\n

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For users who want to understand and control their security.<\/h4>\n

Coldcard MK4 does not try to hide self-custody behind an overly simplified interface. Instead, it gives you the tools to build your own security model: air-gapped PSBT signing via MicroSD, two Secure Elements, anti-phishing words, Trick PINs, BIP39 passphrases, dice-based seed generation, encrypted backups, and multisig. It is a Bitcoin hardware wallet for users who are willing to spend time setting it up properly in exchange for greater control. The MK4 is well suited for long-term BTC storage, personal multisig setups, and workflows that do not depend on a closed ecosystem built around a single app.[\/vc_column_text][vc_column_text]<\/p>\n

\"Coldcard<\/div>\n

[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_tta_section][vc_tta_section title=”Video review” tab_id=”1775558748553-400c32da-ca77″][vc_row_inner][vc_column_inner][vc_video link=”https:\/\/www.youtube.com\/watch?v=z-HbVnQphY0″][\/vc_column_inner][\/vc_row_inner][\/vc_tta_section][vc_tta_section title=”Supported currencies” tab_id=”1775558750515-af55967b-63e1″][vc_row_inner][vc_column_inner width=”1\/2″][vc_column_text]Coldcard MK4 is a specialized Bitcoin-only hardware wallet. It is designed to create or import a BIP39 seed phrase, securely store keys, and sign transactions on the Bitcoin network.<\/p>\n

The device does not support Ethereum, Solana, XRP, stablecoins, or other altcoins. This specialization allows its interface, firmware, and security model to remain focused entirely on Bitcoin self-custody.<\/p>\n

Supported:
\nBitcoin BTC[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_column_text]<\/p>\n

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\"Coldcard<\/div>\n<\/div>\n

[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_tta_section][vc_tta_section title=”What’s in the Box?” tab_id=”1670603831838-f94c6c66-4e81″][vc_row_inner][vc_column_inner width=”1\/2″][vc_column_text]Coldcard MK4 hardware wallet
\nProtective cover
\nSeed phrase backup card
\nCoinkite stickers
\nFactory tamper-evident bag[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_column_text]<\/p>\n

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\"Coldcard<\/div>\n<\/div>\n

[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_tta_section][\/vc_tta_tabs][\/vc_column][\/vc_row][vc_row css=”.vc_custom_1651450329230{margin-top: 30px !important;margin-bottom: 40px !important;}”][vc_column][vc_separator title=”FAQ”][\/vc_column][vc_column][vc_tta_accordion][vc_tta_section title=”Does Coldcard MK4 support Bitcoin only?” tab_id=”1775564785219-5b6271ae-e223″][vc_column_text]Yes. Coldcard MK4 is a Bitcoin-only hardware wallet. It does not support Ethereum, Solana, XRP, stablecoins, or other altcoins.<\/p>\n

The device is designed for storing keys and signing Bitcoin transactions, including single-signature, multisig, watch-only, and air-gapped PSBT workflows.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Can Coldcard MK4 be used completely air-gapped?” tab_id=”1775564941511-aa2aad47-b81d”][vc_column_text]Yes. Coldcard MK4 can be powered by a separate USB power adapter, power bank, or COLDPOWER, while files are transferred using a MicroSD card. In this setup, there is no need to connect the device to a computer with a data cable.<\/p>\n

A watch-only wallet creates the PSBT, the file is transferred to the MicroSD card, signed on the Coldcard, and then returned to the wallet for broadcasting to the Bitcoin network.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”What is a PSBT and why is it used?” tab_id=”1775564826684-d4499ef4-bf1b”][vc_column_text]PSBT stands for Partially Signed Bitcoin Transaction. It contains the information Coldcard needs to review and sign a transaction without exposing the private key.<\/p>\n

With PSBT, you can create a transaction on a computer using a watch-only wallet, transfer it to Coldcard via MicroSD or another supported method, review it on the device screen, and sign it in an isolated environment.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Do I need a MicroSD card for Coldcard MK4?” tab_id=”1775564878123-92bfe2ad-137b”][vc_column_text]A MicroSD card is used for the traditional air-gapped workflow: exporting a watch-only wallet, transferring PSBT files, saving signed transactions, creating backups, and updating firmware without a USB data connection to a computer.<\/p>\n

The MK4 can also be used via USB-C, NFC, or USB Virtual Disk Mode. A MicroSD card is not included in the standard package and must be purchased separately. Cards up to 32 GB formatted as FAT12 or FAT32 are supported.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Why does Coldcard MK4 use two Secure Elements?” tab_id=”1775564878123-92bfe2ad-137c”][vc_column_text]Two Secure Elements from different manufacturers store and protect the wallet\u2019s critical secrets. This architecture reduces reliance on a single security chip and makes physical attacks more difficult.<\/p>\n

Compromising the keys requires more than finding a vulnerability in just one component, because the security model also involves the second Secure Element and the main microcontroller.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”What are anti-phishing words?” tab_id=”1775564878123-92bfe2ad-137d”][vc_column_text]The Coldcard MK4 PIN is divided into two parts. After you enter the first part, the device displays two unique words. During the initial setup, you should memorize these words and verify them before entering the second part of the PIN in the future.<\/p>\n

If the words do not match, do not continue entering your PIN. It may indicate that you are using a different or modified device.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”What are Trick PINs on Coldcard MK4?” tab_id=”1775564878123-92bfe2ad-137e”][vc_column_text]Trick PINs are additional PIN codes that can trigger different actions. Depending on how they are configured, they can open a duress wallet, introduce a login delay, delete the seed, or lock the Secure Element.<\/p>\n

These are advanced features intended for experienced users. Before enabling them, carefully read the documentation and verify that you have a working backup of your seed phrase, as some actions cannot be reversed.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Is NFC safe to use?” tab_id=”1775564878123-92bfe2ad-137f”][vc_column_text]NFC on Coldcard MK4 is disabled by default and can only be enabled by the user. It operates over a very short range and can transfer PSBTs, addresses, XPUBs, and signed transactions to a compatible smartphone.<\/p>\n

If you do not plan to use NFC, you can simply leave it disabled. The board also provides an option to physically and permanently disable the NFC circuit.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Which wallets work with Coldcard MK4?” tab_id=”1775564878123-92bfe2ad-137g”][vc_column_text]Coldcard MK4 is compatible with Sparrow Wallet, Electrum, Nunchuk, Specter Desktop, Wasabi Wallet, BlueWallet, and other Bitcoin wallets and tools.<\/p>\n

Available connection methods depend on the specific application. The most common air-gapped setup uses Sparrow Wallet or Electrum with PSBT files transferred via MicroSD.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Does Coldcard MK4 have a built-in battery?” tab_id=”1775564878123-92bfe2ad-137h”][vc_column_text]No. Coldcard MK4 does not have a built-in battery and requires external power through USB-C.<\/p>\n

For air-gapped use, the device can be powered by a standard wall adapter, power bank, a dedicated power-only cable, or COLDPOWER with a battery. USB data transfer is not required.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”How can I check whether my Coldcard MK4 has been opened?” tab_id=”1775564878123-92bfe2ad-137i”][vc_column_text]A new Coldcard is shipped in a factory tamper-evident bag with a unique number. Before opening it, inspect the bag for damage, signs of resealing, or any other evidence of tampering.<\/p>\n

During the first startup, the bag number should be compared with the number stored in the device\u2019s protected memory. If the numbers do not match or the packaging looks suspicious, do not generate a seed phrase or use the device.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Why do you need a hardware solution?” tab_id=”1568244234276-18584b5c-2166″][vc_column_text]A hardware wallet keeps your private keys separate from your phone, computer, and online services. Even if the connected computer or phone is infected with malware, the transaction still needs to be reviewed and confirmed on the hardware wallet itself.<\/p>\n

Coldcard MK4 also allows transactions to be signed without a direct connection to a computer by using PSBT files and a MicroSD card.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Why is your store better than the rest?” tab_id=”1568244234287-a88a629e-6ce1″][vc_column_text]LWallet.com.ua is a Ukrainian online store specializing in hardware wallets, security devices, seed phrase backup solutions, and accessories.<\/p>\n

We offer a wide range of devices, deliver orders throughout Ukraine, and help customers with setup. In addition to selling hardware, we provide guidance on secure asset storage. All products are covered by warranty, and we work only with original devices.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”What’s the warranty on the devices?” tab_id=”1568244416703-b73f91b7-619b”][vc_column_text]We provide the manufacturer\u2019s warranty and will replace any defective device within one year.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”What does technical support mean?” tab_id=”1568244417949-1f88e967-c8b0″][vc_column_text]We can help you set up the device in our office or remotely. If you have any questions about your hardware wallet, we can assist you by phone or via Zoom.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Where can I order delivery?” tab_id=”1568244419027-1776864c-710c”][vc_column_text]We deliver to any city of Ukraine. During checkout, you can choose a convenient branch or pickup point.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Can I pay upon delivery?” tab_id=”1568244432719-c4730277-fdc6″][vc_column_text]Yes. You can pay the courier or pay at the pickup point when you receive your order. Prepayment by bank transfer is also available.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Do you sell original products?” tab_id=”1568244432719-c4730277-fdc7″][vc_column_text]Yes. We sell original products only. A new Coldcard MK4 is supplied in a factory tamper-evident bag with a unique number that is verified during the initial setup.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Buy from the manufacturer?” tab_id=”1781813075547-5fcae3b0-a46c”][vc_column_text]You can view the Coldcard MK4 on the manufacturer\u2019s official website, but availability from Coinkite may change because newer devices are already part of the current product lineup.<\/p>\n

When ordering from abroad, you also need to account for international shipping, delivery times, and handling warranty claims directly with the manufacturer. We usually ship orders on the same day and provide assistance with setup and warranty service.
\nGo to the manufacturer’s website<\/a>[\/vc_column_text][\/vc_tta_section][\/vc_tta_accordion][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Meet a true cypherpunk in the world of hardware wallets! One of the most secure and trusted devices for storing Bitcoin. <\/p>\n","protected":false},"featured_media":29379,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[652],"product_tag":[2520],"class_list":["post-72930","product","type-product","status-publish","has-post-thumbnail","product_cat-wallets","product_tag-coinkite-en","pa_brand-coinkite","pa_color-transparent","pa_compatibility-android","pa_compatibility-ios","pa_compatibility-linux","pa_compatibility-macos-10-11","pa_compatibility-windows-10","pa_country_of_manufacturer-canada","pa_currency-bitcoin","pa_port-usb-type-c","pa_size-70-x-50-x-20-mm","pa_warranty-12-months","pa_weight-28-grams","first","instock","sale","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/lwallet.com.ua\/en\/wp-json\/wp\/v2\/product\/72930","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lwallet.com.ua\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/lwallet.com.ua\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/lwallet.com.ua\/en\/wp-json\/wp\/v2\/comments?post=72930"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lwallet.com.ua\/en\/wp-json\/wp\/v2\/media\/29379"}],"wp:attachment":[{"href":"https:\/\/lwallet.com.ua\/en\/wp-json\/wp\/v2\/media?parent=72930"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/lwallet.com.ua\/en\/wp-json\/wp\/v2\/product_brand?post=72930"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/lwallet.com.ua\/en\/wp-json\/wp\/v2\/product_cat?post=72930"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/lwallet.com.ua\/en\/wp-json\/wp\/v2\/product_tag?post=72930"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}